AIR MATH

Math Question

Donna bought a candy bar for \( \$ 1.50 \). She paid with nickels and dimes. She used 21 coins in all. How many nickels ( \( n \) ) and how many did she use?
\[
\begin{array}{c}
n+d=21 \\
.05 n+.10 d=1.50
\end{array}
\]
[?] nickels [ ] dimes

Solution

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